Works with Moser housing ends that accept this seal including but not limited to the Torino, Big Ford, Lamb, Olds/Pontiac, GM Special. 
 
Axles with 1.500" Seal Surface such as 28-35 spline axles using a 1.533 or 1.565" Journal used in conjunction with 9508B, 9508T, 88128, RW508ER-1531
 
Install seal with a seal installation tool. Tap it until it seats on the provision in the base of the housing end. There will be a small lip approxmatly 0.005-0.010" tall where it stops.